Feature/Eventmanager

SEOstats/Helper/Event.php

@@ -0,0 +1,61 @@
+<?php
+namespace SEOstats\Helper;
+
+/**
+ * Event
+ *
+ * @package    SEOstats
+ * @author     Clemens Sahs <clemens.sahs@slides-worker.org>
+ * @license    http://eyecatchup.mit-license.org/  MIT License
+ */
+class Event
+{
+    const STATUS_UNTRIGGERED = 'untriggered';
+    const STATUS_CANCELLED = 'cancel';
+    const STATUS_DONE = 'done';
+    const STATUS_PROGRESS = 'progress';
+
+    protected $data = array();
+    protected $status = self::STATUS_UNTRIGGERED;
+    protected $exception = null;
+
+    public function cancel()
+    {
+        $this->status = self::STATUS_CANCELLED;
+    }
+
+    public function isInProgress()
+    {
+        return ($this->status === self::STATUS_PROGRESS);
+    }
+
+    public function startProgress()
+    {
+        $this->status = self::STATUS_PROGRESS;
+    }
+
+    public function setException($exception)
+    {
+        $this->exception = $exception;
+    }
+
+    public function getException()
+    {
+        return $this->exception;
+    }
+
+    public function setProp($key, $value)
+    {
+        $this->data[$key] = $value;
+    }
+
+    public function getProp($key)
+    {
+        return $this->data[$key];
+    }
+
+    public function stopProgress()
+    {
+        $this->status = self::STATUS_DONE;
+    }
+}

SEOstats/Helper/EventManager.php

@@ -0,0 +1,83 @@
+<?php
+namespace SEOstats\Helper;
+
+/**
+ * EventManager
+ *
+ * @package    SEOstats
+ * @author     Clemens Sahs <clemens.sahs@slides-worker.org>
+ * @license    http://eyecatchup.mit-license.org/  MIT License
+ */
+class EventManager
+{
+    protected $listeners = array();
+    protected $instance = null;
+
+    protected function __construct()
+    {
+    }
+
+    public static function getInstance()
+    {
+        if (static::$instance === null) {
+            static::$instance = new static();
+        }
+
+        return static::$instance;
+    }
+
+    public function add($eventKey, $callback)
+    {
+        $cEventKey = $this->canonicalizeName($eventKey);
+
+        $this->listeners[$cEventKey][] = $callback;
+    }
+
+    public function canonicalizeName($name)
+    {
+        $replace = array('-' => '', '_' => '', ' ' => '', '\\' => '', '/' => '');
+
+        return strtolower(strtr($name, $replace));
+    }
+
+    public function remove($eventKey, $callback = null)
+    {
+        $cEventKey = $this->canonicalizeName($eventKey);
+
+        if (is_callable($callback)) {
+            // remove only one callback
+            $this->listeners[$cEventKey] = array_diff($this->listeners[$cEventKey], array($callback));
+        } elseif (is_array($callback)) {
+            // remove only more callback's
+            $this->listeners[$cEventKey] = array_diff($this->listeners[$cEventKey], $callback);
+        } else {
+            // remove all callback's
+            $this->listeners[$cEventKey] = array();
+        }
+    }
+
+    public function trigger($eventKey, Event $event)
+    {
+        $cEventKey = $this->canonicalizeName($eventKey);
+
+        $event->startProgress();
+
+        foreach ($this->listeners[$eventKey] as $listener) {
+            if (!$event->isInProgress()) {
+                return false;
+            }
+
+            try {
+                $result = call_user_func_array($listener, array($event));
+
+                if (!$result) {
+                    $event->cancel();
+                }
+            } catch (\Exception $e) {
+                $event->cancel();
+            }
+        }
+
+        $event->stopProgress();
+    }
+}